Exclude inline caching specs with --default-cache=0

Author: andrykonchin

spec/truffle/regexp/inline_caching_spec.rb

@@ -13,7 +13,7 @@
 # This test requires splitting (--engine.Splitting) which is only available with the OptimizedTruffleRuntime.
 # It fails under --experimental-engine-caching because CallInternalMethodNode does not have cached specializations for
 # !isSingleContext() and so ends up using an IndirectCallNode which prevents splitting.
-guard -> { TruffleRuby.jit? && !Truffle::Boot.get_option('experimental-engine-caching') } do
+guard -> { TruffleRuby.jit? && !Truffle::Boot.get_option('experimental-engine-caching') && Truffle::Boot.get_option("default-cache") != 0 } do
   describe "Inline caching for dynamically-created Regexp works for" do
     before :each do
       @performance_warnings, Warning[:performance] = Warning[:performance], true